E3S-DBP21 is a digital fiber optic sensor made by Omron. It is designed to detect objects up to 50 mm away. It has a detection window of 30 × 30 mm and is IP67-rated for dust and water resistance. The fiber optic head allows for non-contact sensing, making it ideal for use in hazardous environments. It can be used to detect objects in liquids, including those with bubbles, and can also be used to detect gas levels. The device is powered by a 5 to 24VDC supply and is easy to install with a tiltable head, mounting bracket and integral cable. The E3S-DBP21 is a reliable and cost-effective solution for applications in automotive, medical and laboratory fields.